{% spaceless %}
  {% with mainwidget=widget %}
    {% for widget in mainwidget.subwidgets %}
      <div class="form-group row {{ subwidget_class }}">
        <div class="col-sm-2">{{ widget.attrs.label }}</div>
        <div class="col-sm-10">{% include widget.template_name %}</div>
      </div>
    {% endfor %}
  {% endwith %}
{% endspaceless %}